Hi, I am tryin to work out how to do a time based animation using millis()

Basically I am translating Actionscript 3 code to Processing, but I think the way getTimer() in AS3 is different from the millis() method, this is the formula translated in the draw funciton

Code:

PVector position;
PVector velocity;
float gravity = 32;
float bounce = -0.6;
int oldTime;
int radius = 20;


void setup() {
  size(300, 300);
  smooth();
  //frameRate(30);
  ellipseMode(CENTER);
  
  oldTime = 0;
  
  position = new PVector(50, 50);
  velocity = new PVector(10, 0);
}

void draw() {
  background(0);
  
  // *** translated formula
  int time = millis();
  float elapsed = (time - oldTime) / 1000;
  oldTime = time;
  
  PVector accel = acceleration(position, velocity);
  position.x += velocity.x * elapsed;
  position.y += velocity.y * elapsed;
  velocity.x += accel.x * elapsed;
  velocity.y += accel.y * elapsed;
  
  noStroke();
  fill(255);
  ellipse(position.x, position.y, radius, radius);
  
  println(time + " - " + oldTime);
}

PVector acceleration(PVector p, PVector v) {
  return new PVector(0, gravity);
} 

but I get elapsed = 0 of course

Any ideas how can I achive this in Processing?

Cheers
rS

Ys I did that, but got the same results, the issue is that the elapsed time is always 0 because there is no difference between time and oldTime

Cheers
rS

You can change the 1000 in your division to 1000.0 to make Java keep the precision.

Edit: Below is not necessary
Use float for oldTime and time instead of int. Your values are getting cut off (rounded to zero).